Construction of fireproof floors, &amp;c.



'PATENTED MAY 5, 1,903.v

j T. A. NAYLOR.

GONSTRUGTION 0F FIREPROOP FLopRsl,` w.

APPL-IOTION FILED JUNE 4, 1901.

H0` MODEL.

UNrrED STATES Patented May 5, 1903.

`Afri-nvr OFFICE.

'IHOMAS A. NAYLOR, OF BALTIMORE, MARYLAND, ASSIGNOR, BY MESNE ASSIGNMENTS, TO RAILWAY STEEL SFRING COMPANY, A CORPORA- TION.

CONSTRUCTION OF FIREPROOF FLOORS, 80C.

SPECIFICATION forming pm of Letters Patent Natexis?, dated May 5, 19013. applicati@ sied June 4, 1901. 'sriaiumeallh No model.) p

To all whom, it muy concern:

Be it known that I, THOMAS A. NAYLOR, a citizen of the United States Vof America, and a resident of 1116 Park avenue, city of Baltimore, State of Maryland, have invented certain new and useful Improvements in the Construction of Fireproof FloorsA and Similar Structures, of which the following is a specification.

My invention relates to new and useful improvements in the construction of reproof floors and similar structures; and the object thereof is to improve the construction now employed and reduce the cost thereof. In the system of building now commonly employed the space between the I beams or girders which support the load is built in withsome sort of reproof material, such as concrete. The fireproof material has little or no strength in itself and merely increases the loadkcarried by the Agirders. In`V my improved construction I substitute for the heavy load of fireproof material carried between the girders a comparatively light metallic structure. By means of this construction not only is the load carried by the girders decreased, but the ioors do not require as much vertical height as with the ordinary construction, thus saving wall-space.

Referring to the drawings, in which like characters of reference note corresponding parts, Figure 1 is a View taken at right angles to Fig. 2, showing the girders in cross-section and the U -shaped ribs in side elevation. Fig.

2 is a sectional view through a door, showing f the U-shaped ribs and the cover-platesin cross-section.

l designates thev ordinary I-girders, upon which the floor is supported.

2 designates ribs, which are U-shaped in cross-section and whichare suitably fastened" to and supported upon the I-girders. "As I have shown these ribs they consist of a bottom part Sandl sides 4: 4,"which are substantially at right angles to the bottom, and these sides are preferably given a are at the top,

-be found desirable.

as shown at 5. I wishit to be understood, however, that I do not desire to be limited to this particular shape of rib, and while I deem it the best shape it could be varied widely Without departing from my invention. Preferably these ribs are arched, as shown, to increase their carrying power. Spanning the space between the U-shaped ribs are the plates 7. The plates 7 have their side edges 8 turned down toengage with the open side of the U-shaped ribs. When in position, the downturned edges 8 fit snugly against the sides 4 of the U-shaped ribs. These spanning-plates are arched in the direction of their length when they are used in connection with arch-shaped ribs. The space in the U -shaped ribs between the ends of the coverplates is preferably filled with concrete 9 or other fireproof material. j This concrete may .be andlpreferably is extended y over practicallythe entiresurface of th'ecover-plates, so as to present a smooth surface to lay the door upon. By this construction it will be seen that the entire weight of the floor rests directly on the U-shaped ribs. These ribs -are only supported'at their end by the I-girders, and these ribs must therefore be necessarily made of suffi-cient strength to withstand any strain that may be put upon them.

While I have shown and described what I deem to be the preferred form of my invention, it is to be understood that many changes could be made therein without departing from the spirit of my invention.

While I have described this construction in connection with ireproof floors, I desire it to be understood that the construction is applicable to decks of vessels, arches of sewers, roofs for tunnels or buildingssidewfalks over vaults, or in any other place where-it might Having thus describedmy invention, what I claim as new, and desire'to secure by Letters Patent, is

In a ioor construction the combination with girders of two series of arched ribs, arching the space between the girders, one series bethe Whole Siirface above the arch being filled ingconcaveincross-section, and beinglocated and covered with concrete. :o parallel to each other, the concave surface Signed by me at city of Baltimore, State forming the upper surface of the arch, the secof Maryland, this 13th day of May, 1901.

ond series of arched ribs being also concave THOMAS A. NAYLOR. in cross-section, the concave surface forming Witnesses: the under side of the arch, the two series of CHARLES H. MILLIKIN,

arched ribs interlocking with each other, and W. W. POWELL. 

